EP4146467A1 - Machine à onduler simple face pour la fabrication d'un carton ondulé en ayant recours à un système facilité de remplacement de la courroie de pression - Google Patents

Machine à onduler simple face pour la fabrication d'un carton ondulé en ayant recours à un système facilité de remplacement de la courroie de pression

Info

Publication number
EP4146467A1
EP4146467A1 EP21722471.6A EP21722471A EP4146467A1 EP 4146467 A1 EP4146467 A1 EP 4146467A1 EP 21722471 A EP21722471 A EP 21722471A EP 4146467 A1 EP4146467 A1 EP 4146467A1
Authority
EP
European Patent Office
Prior art keywords
guide roller
pivoting
pivoting arm
flexible member
load
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP21722471.6A
Other languages
German (de)
English (en)
Inventor
Mauro Adami
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fosber SpA
Original Assignee
Fosber SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fosber SpA filed Critical Fosber SpA
Publication of EP4146467A1 publication Critical patent/EP4146467A1/fr
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F1/00—Mechanical deformation without removing material, e.g. in combination with laminating
    • B31F1/20—Corrugating; Corrugating combined with laminating to other layers
    • B31F1/24—Making webs in which the channel of each corrugation is transverse to the web feed
    • B31F1/26—Making webs in which the channel of each corrugation is transverse to the web feed by interengaging toothed cylinders cylinder constructions
    • B31F1/28—Making webs in which the channel of each corrugation is transverse to the web feed by interengaging toothed cylinders cylinder constructions combined with uniting the corrugated webs to flat webs ; Making double-faced corrugated cardboard
    • B31F1/2845—Details, e.g. provisions for drying, moistening, pressing
    • B31F1/2863—Corrugating cylinders; Supporting or positioning means therefor; Drives therefor
    • B31F1/2868—Exchangeable corrugating cylinders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F1/00—Mechanical deformation without removing material, e.g. in combination with laminating
    • B31F1/20—Corrugating; Corrugating combined with laminating to other layers
    • B31F1/24—Making webs in which the channel of each corrugation is transverse to the web feed
    • B31F1/26—Making webs in which the channel of each corrugation is transverse to the web feed by interengaging toothed cylinders cylinder constructions
    • B31F1/28—Making webs in which the channel of each corrugation is transverse to the web feed by interengaging toothed cylinders cylinder constructions combined with uniting the corrugated webs to flat webs ; Making double-faced corrugated cardboard
    • B31F1/2804—Methods
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F1/00—Mechanical deformation without removing material, e.g. in combination with laminating
    • B31F1/20—Corrugating; Corrugating combined with laminating to other layers
    • B31F1/24—Making webs in which the channel of each corrugation is transverse to the web feed
    • B31F1/26—Making webs in which the channel of each corrugation is transverse to the web feed by interengaging toothed cylinders cylinder constructions
    • B31F1/28—Making webs in which the channel of each corrugation is transverse to the web feed by interengaging toothed cylinders cylinder constructions combined with uniting the corrugated webs to flat webs ; Making double-faced corrugated cardboard
    • B31F1/2845—Details, e.g. provisions for drying, moistening, pressing
    • B31F1/2877—Pressing means for bringing facer sheet and corrugated webs into contact or keeping them in contact, e.g. rolls, belts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F1/00—Mechanical deformation without removing material, e.g. in combination with laminating
    • B31F1/20—Corrugating; Corrugating combined with laminating to other layers
    • B31F1/24—Making webs in which the channel of each corrugation is transverse to the web feed
    • B31F1/26—Making webs in which the channel of each corrugation is transverse to the web feed by interengaging toothed cylinders cylinder constructions
    • B31F1/28—Making webs in which the channel of each corrugation is transverse to the web feed by interengaging toothed cylinders cylinder constructions combined with uniting the corrugated webs to flat webs ; Making double-faced corrugated cardboard
    • B31F1/2831—Control
    • B31F1/2836—Guiding, e.g. edge alignment; Tensioning

Definitions

  • the present invention relates to machines for manufacturing a corrugated board. More particularly, the invention relates to improvements to corrugators or so- called “single facers”.
  • the corrugated board is manufactured starting from smooth paper webs, un- wound from suitable reels.
  • the corrugated board consists of a smooth paper web and a corrugated paper web, glued together along the ridges of the waves of the corrugated paper web.
  • a second smooth paper web glued to the corrugated paper web so that the latter is inter posed between the two smooth paper webs, also called liners.
  • added to this structure consisting of three paper webs are others with a sequence of corrugated paper webs interposed between smooth paper webs.
  • the single face corrugated board is produced by a “single facer”, comprising a pair of mutually meshing corrugating rollers, between which a first smooth paper web is supplied.
  • the first smooth paper web is hot-deformed into the nip between the two corrugating rollers and it becomes a fluted paper web.
  • An adhesive is applied on the ridges of the flutes of the fluted paper web adherent to one of the corrugating rollers and a smooth paper web is pressure-and heat-applied on the fluted paper web provided with an adhesive.
  • a pressing unit comprising at least one pressing member which is pressed against one of the corrugating rollers is provided for gluing the fluted paper web and the smooth paper web to each other.
  • the smooth paper web and the fluted paper web pass between the corrugating roller and the pressing member.
  • the pressing unit comprises a continuous flexible mem ber, in the form of a belt, which is driven around guide rollers.
  • Examples of single facers of this type are disclosed in US9, 545,769, EP0698752, US10,293,588, US2015/0122423, US5,512,020, EP2805810, EP2792477, US5,951,817,
  • US2,638,962 discloses a corrugator comprising a pressing belt driven about two guide rollers, the first of which is rotatable about a fixed axis with respect to the load-bearing structure and the second is movable with a rotary movement about the fixed axis of the first roller.
  • the belt When the belt is moved away from the corrugating rollers, it presses against an outer cylinder that keeps the belt stretched.
  • JP11105172 discloses a corrugator with a pressing belt driven about three rollers.
  • a complex system of actuators drives the movement of two belt guide rollers to control the traction of the belt and to keep the belt guided properly.
  • a further corrugator with a pressing belt and members for controlling the stretch and for guiding the belt is disclosed in JP2962660. Also in this case the belt is guided by a complex system of three guide rollers and relative actuators which control the movements thereof.
  • EP3556548 discloses a single facer with a mechanism for replacing the cor rugating rollers.
  • the single facer further comprises a pair of fixed-axis guide rollers, about which a pressing belt is driven. The pressing belt is raised when the corrugating rollers are removed from the single facer.
  • continuous flexible members are complex, high-cost machine elements. They are subject to wear and must be replaced periodically. Replacement entails ma chine downtime. Replacement operations must be carried out cautiously and by trained personnel, so as to avoid damaging the new continuous flexible member which is mounted in place of the worn one.
  • a single facer for manufacturing a single face corru gated board comprising: a load-bearing frame; a first corrugating roller and a second corrugating roller, meshing with each other and associated with the load- bearing frame; and a pressing unit pivoted to the load-bearing frame about a pivoting hinge, to be brought, by means of rotation about the pivoting axis, to a working posi tion and to a non-working position.
  • the pressing unit in turn comprises: a first pivoting arm; a second pivoting arm rigidly connected to the first pivoting arm; a first guide roller with a first rotation axis, supported on the first pivoting arm and on the second pivoting arm; a second guide roller with a second rotation axis, supported on the first pivoting arm and on the second pivoting arm; a continuous flexible member, guided about the first guide roller and the second guide roller.
  • the first pivoting arm is adapted to support, in a cantilevered fashion on the load-bearing frame, the second pivoting arm, the first guide roller and the second guide roller, to allow removal of the contin uous flexible member from the side of the second pivoting arm.
  • a single facer having a load-bearing frame and a pair of first and second corrugating roller meshing with each other and mounted in the load-bearing frame.
  • the single facer further comprises a pressing unit for exerting gluing pressure between a smooth paper web and a fluted paper web.
  • the pressing unit comprises a pivoting structure, pivoted to the load-bearing frame about a pivoting axis.
  • the pivoting structure comprises a first pivoting arm, pivoted to the load-bearing frame by means of a first hinge system on a first side of the single facer, and a second pivoting arm on a second side of the single facer.
  • the two pivoting arms are rigidly connected to each other, for example by means of a beam.
  • the pivoting structure supports a first guide roller with a first rotation axis supported on the first pivoting arm and the second pivoting arm, and a second guide roller with a second rotation axis supported on the first pivoting arm and the second pivoting arm.
  • a continuous flexible member, guided about the first guide roller and the second guide roller is guided between the two guide rollers.
  • the guide rollers have axes approximately parallel to each other and parallel to the pivoting axis about which the pivoting structure pivots with respect to the load-bearing frame.
  • the pivoting axis is in turn approximately parallel to the axes of the corrugating rollers.
  • the parallelism of the rotation axes of the guide rollers with respect to each other and with respect to the pivoting axis of the pivoting structure may not be precise, given that the position of one or both of the rotation axes of the guide rollers can be changed to keep the continuous flexible member guided properly and to stretch it correctly.
  • the pivoting axis of the pivoting structure is spaced both from the first rotation axis of the first guide roller and from the second rotation axis of the second guide roller. As a matter of fact, this simplifies the structure of the single facer and it allows an easier replacement of the continuous flexible member. However, it cannot be ruled out that the pivoting axis of the pivoting structure is approximately is coincident with the pivoting axis of one of the guide rollers.
  • the single facer further comprises: a first actuator associated with the first pivoting arm and forming a first constraint between the first pivoting arm and the load- bearing frame; and a second actuator associated with the second pivoting arm and forming a second constraint between the second pivoting arm and the load-bearing frame.
  • the first actuator and the second actuator are adapted to bring the pivoting structure alternatively to a working position, and to a raised position, wherein the first guide roller and the second guide roller are spaced from the second corrugating roller.
  • the first hinge system with which the first pivoting arm is pivoted to the load-bearing frame, forms a constraint with the load-bearing frame adapted to support, in a cantilevered fashion, the second pivoting arm and the first guide roller and the second guide roller, mounted between the first pivoting arm and the second pivoting arm, so as to allow the removal of the continuous flexible member from the second side of the single facer.
  • the second pivoting arm can be constrained to the first pivoting arm by means of a connecting beam and further connected to the load-bearing frame by means of the second actuator, without being in turn pivoted to the load-bearing frame by means of a hinge.
  • the second pivoting arm is also pivoted to the load-bearing frame and a second hinge system can be provided to this end.
  • the second pivoting arm is connected to the load-bearing frame by means of a removable element which is disassembled to remove the continuous flexible mem ber from the first and second guide roller.
  • a removable element may comprise a removable bracket which connects the second pivoting arm to the second hinge system.
  • the first hinge system by means of which the first pivoting arm is pivoted to the load-bearing frame, may comprise two hinges spaced apart along the pivoting axis of the pivoting structure, to provide resistance to a tipping torque generated by the weight of the first guide roller, the second guide roller and the second pivoting arm, when the latter is released from the load-bearing frame and held, in a cantilevered fashion together with the two guide rollers, by the first pivoting arm.
  • a method for operating a single facer as defined above, in which the following steps are carried out to replace the continuous flexible member: moving the first guide roller and the second guide roller away from the second corrugating roller; releasing the second actuator from the second pivoting arm and supporting the second pivoting arm, the first guide roller and the second guide roller in a cantile vered fashion by means of the first pivoting arm; removing the continuous flexible member from the first guide roller and from the second guide roller; inserting a new continuous flexible member on the first guide roller and on the second guide roller; connecting the second actuator to the second pivoting arm; and lowering the pivoting structure toward the second corrugating roller and press ing the continuous flexible member against the second corrugating roller.
  • the method may further comprise the steps of: releasing the sec ond pivoting arm from the second hinge system with which the second pivoting arm is hinged to the load-bearing frame, before removing the continuous flexible member from the first guide roller and from the second guide roller; and connecting the second pivoting arm to the second hinge system after inserting the new continuous flexible member onto the first guide roller and onto the second guide roller.
  • a single facer for manufac turing a single face corrugated board comprising a load-bearing frame in which a first corrugating roller and a second corrugating roller can be mounted, meshing with each other and mounted in the load-bearing frame.
  • the single facer further comprises a pressing unit adapted to press against the second corrugating roller.
  • the pressing unit comprises a first guide roller pivotally supported about a first rotation axis and a sec ond guide roller pivotally supported about a second rotation axis. A continuous flexible member is guided about the guide rollers.
  • the first guide roller and the second guide roller are sup ported by a pivoting structure, pivoted to the load-bearing frame about a pivoting axis, approximately parallel to the axis of the first corrugating roller and the second corru gating roller.
  • a control system adapted to rotate the pivoting structure to a working position, wherein the continuous flexible member is pressed against the second corru gating roller, and to a raised position, wherein the first guide roller and the second guide roller are spaced from the second corrugating roller, is associated to the pivoting structure.
  • This single facer may comprise, in combination other features described herein, and in particular one or more of the features defined in the attached claims.
  • Fig. 1 shows a lateral view of the single facer in the working position
  • Fig. 2 shows a lateral view of the single facer of Fig. 1, from the opposite side with respect to Fig. 1;
  • Fig. 2A shows a very simplified section of the single facer according to an inter mediate vertical plane between the two sides;
  • Fig. 2B shows a section of the single facer in the position shown in Figs. 1 and 2, according to an intermediate vertical plane between the two sides;
  • Fig. 3 shows a lateral view similar to Fig. 1, with the pressing unit raised;
  • Fig. 4 shows a lateral view similar to Fig. 2, with the pressing unit raised;
  • Fig. 5 shows a section of the single facer in the position shown in Figs. 3 and 4, according to an intermediate vertical plane between the two sides of the single facer;
  • Fig. 6 shows a view similar to Fig. 3 with the cassette of the corrugating rollers removed;
  • Fig. 7 shows a view similar to Fig. 4 with the cassette of the corrugating rollers removed;
  • Fig. 8 shows a section according to an intermediate vertical plane of the single facer of Fig. 7;
  • Fig. 9 shows an enlargement of a detail of Fig. 8 with parts removed;
  • Fig. 10 shows a lateral view similar to the view of Fig. 6, with the pressing unit lowered;
  • Fig. 11 shows a lateral view similar to the view of Fig. 7 with the pressing unit lowered
  • Fig. 12 shows a lateral view similar to the view of Fig. 11 with the actuator of the pressing unit detached from the respective pivoting arm;
  • Fig. 13 shows an axonometric view of the single facer in the position of Fig. 12, with the continuous flexible member partially extracted from the guide rollers;
  • Fig. 14 shows a view of the single facer according to the line XIV-XIV of Fig. 13;
  • Fig. 17 shows a plan view of the pressing unit
  • Fig. 18 shows a view according to XVIII-XVII of Figure 17;
  • Fig. 19 shows a view according to XIX-XIX of Fig. 17;
  • Fig. 20 shows a section according to XX-XX of Fig. 17;
  • Fig. 21 shows a section according to XXI-XXI of Fig. 19;
  • Fig. 22 shows a section according to XXII-XXII of Fig. 19;
  • Fig. 23 shows a partial axonometric view of the pressing unit, on the side on which the motor for actuating the continuous flexible member is mounted;
  • Figs. 24 A and 24B show partial axonometric views of the pressing unit 21 show ing the sensors for detecting the position of the continuous flexible member 31;
  • Figs. 25 A, 25B show two schematic lateral views of the pressing unit illustrating the movement of one of the two guide rollers of the continuous flexible member to adjust the stretch thereof;
  • Figs. 26 and 27 show two schematic views of the pressing unit, illustrating the movement of one of the guide rollers of the continuous flexible member to correct the twisting thereof;
  • Figs. 28A, 28B show two schematic views of the pressing unit illustrating the movement of one of the two guide rollers of the continuous flexible member to correct the twisting thereof.
  • the general structure of the single facer 1 may be understood from Figs. 1, 2 and 2A, the first two of which show lateral views of the single facer from two opposite sides and Fig.2A shows a very simplified section, according to an intermediate vertical plane between the two sides, in which only the main components of the single facer 1 are shown. Fig.2B shows a section according to an intermediate vertical plane between the two sides of the single facer.
  • the single facer 1 comprises a load-bearing frame 3, on which the corrugating rollers are supported, and a pressing unit which serves to press against each other the two paper webs which form a single face corrugated board sheet, not shown in the drawings.
  • the load-bearing frame comprises a first side wall 5 on a first side of the single facer 1 and a second side wall 7 on a second side of the single facer 1; see also in particular Figs. 14 and 17.
  • the two side walls 5 and 7 are joined to each other by crosspieces 9, 11 shown in particular in Figs. 13 and 14, where the corrugating rollers of the single facer 1 were removed.
  • the first side is the one on which the drive means are located and the second side is the operator side, i.e. the side from which the operator usually has access to the single facer 1.
  • a cassette or cartridge 13 comprising a first corrugating roller 15 and a second corrugating roller 17 superimposed to the first corrugating roller is inserted into the load-bearing frame 3.
  • the cartridge 13 is replaceable, i.e. interchangeable, to change the characteristics of the corrugated web manufactured by the single facer 1, using different corrugating rollers 15, 17.
  • the cassette 13 is supported in the load-bearing frame 3 of the single facer 1 by means of two shaped support profiles 13.1 and 13.2, which co-act with complemen tary support profiles 3.1 and 3.2 integrally joined with the load-bearing frame 3.
  • the cassette is inserted into the single facer 1 on one side of the single facer 3, normally on the side defined by the second side wall 7. It cannot be ruled out that the insertion be carried out on the opposite side, or alternatively on both sides.
  • the cassette 13 is inserted into the load-bearing frame 3 and supported on the support profiles 3.1, 3.2 where it remains stationary due to the weight of the cassette and the corrugating rollers 15, 17 and due to the thrust of the pressing unit, to be described hereinafter.
  • the corrugating rollers 15, 17 are per se known and thus they are not de scribed in detail. Each of them has a corrugated cylindrical surface and the two fluted cylindrical surfaces mesh with each other at a corrugation nip defined between the two corrugating rollers 15, 17, where a first smooth paper web passes, which is corrugated due to the pressure applied by the two corrugating rollers.
  • the first corrugating roller 15 co-acts with an adhesive applicator 16, shown only in the simplified section of Fig.2A, and which applies an adhesive to the ridges of the flutes formed on the first paper web before a second smooth paper web is applied thereonto (while still adhering to the second corrugating roller 17).
  • the single facer 1 com prises a pressing unit or assembly 21, arranged so as to act from the top downwards on the upper part of the second corrugating roller 17, about which the two paper webs are guided.
  • the pressing unit or assembly 21 comprises a pivoting structure, in turn com prising a first pivoting arm 23 on the first side of the load-bearing frame 3, and a second pivoting arm 25 on the second side of the load-bearing frame 3.
  • the two pivoting arms 23, 25 can be rigidly connected to each other, for example by means of a beam 27.
  • both the pivoting arms 23, 25 are hinged to the load-bear ing frame 3 about a pivoting axis 29, parallel to the axes of the corrugating rollers 15, 17 when the latter are mounted in the single facer 1.
  • the pressing unit or assembly 21 further comprises a continuous flexible member 31, for example a continuous belt.
  • the continuous flexible member 31 is guided about a first guide roller 32, rotating about a first rotation axis 33, and about a second guide roller 35, rotating about a second rotation axis 37.
  • the guide rollers 32, 35 and the respective rotation axes 33, 37, as well as the continuous flexible member 21 are shown in particular in the section of Fig. 5 and of Fig. 8.
  • a first smooth paper web N1 is guided about a heated roller 20 and supplied into the corrugation nip between the first corrugating roller 15 and the second corrugating roller 17, where it is permanently deformed with the formation of flutes parallel to the rotation axes of the corrugating rollers 15, 17.
  • the first paper web N1 remains adherent to the second corrugating roller 17 and receives, on the flutes thus formed, an adhesive applied by the adhesive applicator 16.
  • the first corrugated web N1 is guided by the second corrugating roller 17 under the pressing unit 21 and more precisely between the corrugated surface of the second corrugating roller 17 and the continuous flexible member 31, which acts on the second corrugating roller 17.
  • a second smooth paper web N2 is guided about a heated roller 22 and supplied between the first fluted web Nl, adherent to the second corrugating roller 17, and the pressing unit 21, and more precisely under the continu ous flexible member 31 of the pressing unit 21.
  • the pressure exerted on the two webs Nl, N2 in the nip between the pressing unit 21 and the second corrugating roller 17 causes the mutual adhesion of the webs Nl, N2.
  • the first guide roller 32 and the second guide roller 35 define a first branch of the continuous flexible member 31, which consists in the portion of continuous flexible member 31 between the two guide rollers 32, 35 facing toward the second corrugating roller 17.
  • the first branch of the continuous flexible member 31 constitutes the active branch, i.e. the one that is pressed against the second corrugating roller 17.
  • a second branch, or return branch, of the continuous flexible member 31 is again de fined between the guide rollers 32, 35 on the opposite side, i.e. facing opposite the second corrugating roller 17.
  • a gearmotor 39 which provides the rotary motion to the second guide roller 35 and therefore to the continuous flexible member 31, is mounted on the first pivoting arm 5, while the first guide roller 32 is mounted idle on the pivoting arms 23, 25.
  • the gearmotor 39 is not provided and both the guide rollers 32 and 35 are mounted idle on the pivoting structure.
  • the movement of the continuous flexible member can be provided via friction by the sec ond corrugating roller 17.
  • the first pivoting arm 23 is constrained to a first linear actuator 41, for exam ple a cylinder-piston actuator, preferably of the hydraulic type.
  • a first linear actuator 41 for exam ple a cylinder-piston actuator, preferably of the hydraulic type.
  • One end 41.1 of the linear actuator 41 is pivoted to the load-bearing frame 3 and a second end 41.2 of the linear actuator 41 is pivoted to the first pivoting arm 25.
  • a second linear actuator 43 which constrains the second pivoting arm 25 to the load-bearing frame 3.
  • One end 43.1 of the linear actuator 43 is pivoted to the load-bearing frame 3 and a second end 43.2 of the linear actuator 43 is pivoted to the second pivoting arm 25.
  • the two linear actuators 41, 43 control the pivoting movement of the pivoting structure, comprising the pivoting arms 23, 25 and the beam 27, about the pivoting axis 29 to carry out the operations that will be described here inafter.
  • the features which facilitate the replacement of the corrugating rollers can be used in a single facer 1, which has a different system for the replacement of the continuous flexible member and/or a dif ferent system for controlling the traction and keeping the continuous flexible member guided.
  • the features and elements for facilitating the replacement of the con tinuous flexible member can be used with a different system for facilitating the re placement of the corrugating rollers and/or with a different system for controlling the traction and keeping the continuous flexible member guided.
  • the latter can also be used in single facers with a different system for changing corrugating rollers and/or for replacing the continuous flexible member.
  • Figs. 1 and 2 show the side views of the first side and the second side of the single facer 1 with a cartridge or cassette 13 and the respective corrugating rollers 15, 17.
  • the pressing unit 21 is in the working position, i.e. in a lower position. In this position, the continuous flexible member 31 is pressed against the upper part of the second corrugating roller 17, i.e. the corrugating roller arranged at a higher level in the cartridge 13 resting on the load-bearing frame 3.
  • each of the pivoting arms 23, 25 have an abutment 23A and 25A.
  • the two abutments 23 A, 25 A are arranged so as to co-act with abutments 13 A carried by the cartridge 13.
  • the abutments 23 A, 25 A are visible in particular in Figs. 2, 4, 5, 7.
  • One of the abutments 13 A is visible in particular in Fig. 2.
  • the pivoting arms 23, 25 take an angular position defined by the resting of the abutments 23 A, 25A on the abut ments 13A of the cassette 13, which in turn rests on the support profiles 3.1, 3.2.
  • the pressure exerted by the actuators 41, 43 keeps the pivoting arms 23, 25 in position and contributes towards keeping the cassette 13 of the corrugating rollers 15, 17 in the correct position.
  • Stretching actuators to be described hereinafter, apply traction to the contin uous flexible member 31 when the pressing unit 21 is in the working position, so as to keep the continuous flexible member 31 adherent to the paper webs (not shown) inter posed between the continuous flexible member 31 and the second corrugating roller 17.
  • the traction of the continuous flexible member reduces the thrust exerted by the actuators 41, 43 on the abutments 13 A
  • the pressing unit 21 In order to replace the cassette 13, the pressing unit 21 is firstly rotated up wards, with a rotary movement about the pivoting axis 29. With this movement, the pressing unit 21 is brought to a raised position, spaced from the cassette 13.
  • the lower branch of the continuous flexible member 31, i.e., the branch facing toward the second corrugating roller 17, is kept in traction between the first guide roller 32 and the second guide roller 35 with a mechanism which will be described hereinafter.
  • Providing the pressing unit 21 with a raising and lowering movement about the pivoting axis 29, allows to obtain an extremely simple and reliable system for carrying out the various operations required by the single facer, and in particular: keep ing the continuous flexible member 31 under pressure against the second corrugating roller 17 during the production of corrugated board; the operations of replacing the cassette 13; the operations of replacing the continuous flexible member 31.
  • the cassette 13 When the pivoting structure is in the raised position, the cassette 13 can be raised from the support profiles 3.1 and 3.2 and can be removed from the single facer 1. In the illustrated embodiment, the cassette 13 may preferably be removed by ex tracting it from the second side of the single facer 1, but removing it from the first side of the single facer 1 cannot be ruled out.
  • Figs. 6, 7 and 8 show the side views and the section of the single facer 1 after removing the cassette 13.
  • the continuous flexible mem ber 31 is a very expensive machine element.
  • the corrugating rollers are heated so as to accelerate the mutual gluing between the paper webs which form the corrugated board and the traction to which the continuous flexible member 31 is subjected is very high so as to generate a high pressure against the second corrugating roller 17, again to accelerate gluing of the paper webs that form the corrugated board.
  • the pressing unit or assembly 21 comprises a stretching device, indicated in its entirety with 51 and visible in particular in Figs. 8 and 9.
  • the stretching device 51 comprises a stretching bar 53, which is arranged in the closed path defined by the continuous flexible member 31.
  • the stretching bar 53 extends approximately parallel to the pivoting axis 29 and it is carried by the pivoting structure. Therefore, the stretching bar participates in the pivoting movement of the pivoting structure about the pivoting axis 29.
  • the stretching bar 53 is in the non-operative position and preferably it is not in contact with the continuous flexible member 31, or in any case it does not apply any considerable force thereto.
  • the stretching bar 53 can be housed in the space between the first guide roller 32 and the second guide roller 35.
  • the stretching bar 53 rises together with the pivot ing structure and at the same time it performs a movement with respect to the first guide roller 32 and the second guiding roller 35, so as to push from inside against the second branch of the continuous flexible member 31, facing the side opposite the sec ond corrugating roller 17.
  • Figs. 8 and 9 show the final position that the stretching bar 53 takes once the pivoting structure is brought to the fully raised position thereof.
  • the stretching bar 53 of the stretching device 51 pushes the return branch of the continuous flexible member 31 outwards, deforming it and preventing the first branch of such flexible member, facing toward the second corrugating roller 17, from loosening.
  • the first branch of the continuous flexible member 31 remains stretched be tween the first guide roller 32 and the second guide roller 35.
  • the traction exerted on the continuous flexible member 31 is negligible. It is sufficient that it avoids the down ward slackening of the first branch of the continuous flexible member 31.
  • the movement of the stretching bar may be driven by an actuator carried by the pivoting structure comprising the pivoting arms 23, 25 and the beam 27.
  • the stretching device 51 be passively activated when the pivoting structure is brought to the raised position.
  • the stretching bar 53 is carried by a mechanism which co-acts with stationary elements integrally constrained to the load-bearing frame 3, which, as a result of this cooperation, cause the movement of the stretching bar 53 with respect to the pivoting structure 23, 25, 27.
  • the stretching bar 53 is carried by two pivoting levers 55, each associated with a respective pivoting arm 23, 25.
  • the two pivoting levers 55 (only one of which is visible in Figs. 8 and 9) are hinged about a pivoting axis 57 integrally joined with the pivoting arms 23, 25 and substantially parallel to the pivoting axis 29.
  • Each pivoting lever 55 has a first end 55.1 constrained to the stretch ing bar 53 and a second end 55.2 arranged in proximity of the second guide roller 35.
  • the second end of each pivoting lever 55 forms a movable abutment which co-acts with a respective abutment 59 mounted on the load-bearing frame 3.
  • Each abutment 59 can be fixed or almost fixed, for example it can be an elastic abutment for dampen ing the impact of the end 55.2 of the pivoting lever 55.
  • An elastic member 59.1 for example a pneumatic spring, can gradually contract while the pivoting arms 23, 25 reach the maximum raising position.
  • the contraction of the elastic member 59.1 allows the respective abutment 59 to pivot upwards under the thrust of the end 55.2 of the respective pivoting lever 55, while the pivoting point of the latter (axis 57) follows the raising movement of the pivoting structure 23, 25, 27 (see Fig. 9).
  • the elasticity pro vided by each of the two elastic members 59.1 allows to compensate for any extensions or contractions of the continuous flexible member 31, ensuring that it is always suffi ciently stretched by the stretching bar 53.
  • the single facer 1 may comprise means for facilitating the replacement of the continuous flexible member 31.
  • this member is subject to wear due to the high thermal and mechanical stresses to which it is sub jected.
  • the pivoting structure comprising the pivoting arms 23, 25 and the beam 27 is con strained to the load-bearing frame 3 so as to be able to support the guide rollers 32, 35, in a cantilevered fashion, on one of the two pivoting arms and allow the removal of the continuous flexible member 31 from the other side of the pivoting arm.
  • the first pivoting arm 23 is constrained to the load-bearing frame 3 so as to be able to support - in a cantilevered fashion - the first guide roller 32, the second guide roller 35 and the sec ond pivoting arm 25, which can be temporarily disengaged from the load-bearing frame 3 so as to allow the removal and replacement of the continuous flexible member 31 from the side of the second pivoting arm 25.
  • the first pivoting arm 23 comprises a beam 23.3 rigidly connected to the pivoting arm 23 and extending, in a cantilevered fashion, approximately parallel to the pivoting axis 29.
  • the pivoting arm 23 with the respective beam 23.1 define two hinges 23.2 and 23.3 (see in particular Fig. 23), coaxial to each other and spaced along the direction of the pivoting axis 29.
  • the two hinges 23.2 and 23.3 form the elements for constraining the pivoting arm 23 to the load-bearing frame 3 on the side of the side wall 5.
  • the two mutually spaced hinges 23.2, 23.3 provide a constraint to the first pivoting arm 23.
  • the arm 25 is also held - in a cantilevered fashion - by means of the beam 27, which connects the pivoting arms 23, 25 to each other.
  • the guide rollers 32, 35 are supported, together with the pivoting arms 23, 25, by the hinge sys tem 23.2, 23.3, which connects the pivoting arm 23 to the load-bearing frame 3. In this manner, the pivoting arm 25 can be detached from the load-bearing frame 3, allowing easy replacement of the continuous flexible member 31, as described hereinafter.
  • the second pivoting arm 25 is constrained and pivoted to the load-bearing frame 3 by means of a hinge 25.1, shown in particular in Fig. 14.
  • the second pivoting arm 25 is provided with a removable bracket 25.2 which connects the pivoting arm 25 to the hinge 25.1, see in particular the side views of the second side of the single facer 1 (Figs. 2, 4, 7, 11, 12).
  • the function of the bracket 25.2 will be clarified with reference to the sequence of operations for removing a worn continuous flexible member 31. These operations are illustrated in detail in Figs. 7, 8, and 10 to 13.
  • Figs. 7 and 8 show the single facer 1, from which the cassette 13 has been removed, a preliminary operation required to clear the space needed to replace the continuous flexible member 31.
  • the pivoting structure comprising the pivoting arms 23, 25 and the beam 27 with the two guide rollers 32, 35, is lowered by rotating about the pivoting axis 29, until it reaches a position lower than the normal working position, i.e., lower than the position in which the abutments 23 A, 25A of the pivoting arms 23 25 rest on the abutments 13 A of the cassette 13 which is located in the single facer 1.
  • the lowered position of the pivoting structure is shown in Figs. 10, on the side of the side wall 5 and in Figs. 11 and 12 from the side of the side wall 7.
  • the position of the pivoting structure in this operating step is defined by a fixed abutment 61 and by a movable abutment 63.
  • the fixed abutment 61 is integrally joined with the load-bearing frame 3, and more precisely with the first side wall 5 of the load-bearing frame 3.
  • the movable abutment 63 is integrally joined with the first pivoting arm 23.
  • the abutments 61, 63 allow to define the lower position of the pivoting structure and to confer greater stability to the pivoting arm 23 during the step of replacing the con tinuous flexible member 31.
  • the pivoting arm 25 may not be pivoted to the load-bearing frame 3 by means of the hinge thereof.
  • the bracket 25.2 is not provided for and the disengagement of the pivoting arm 25 from the load-bearing frame 3 is faster, given that it only requires the separation of the actuator 43.
  • the arm 25 is basically separated from the load-bearing frame 3. It is held, in a cantilevered fashion, by the beam 27 constrained to the pivoting arm 23. This is constrained to the load-bearing frame 3 by the two hinges 23.2, 23.3, by the actuator 41 and by the abutment 63, which rests on the abutment 61.
  • the continuous flexible member 31 can thus be removed from the guide roll ers 32, 35, as shown in the axonometric view of Fig. 13. Once the worn continuous flexible member 31 has been removed, it can be replaced with a new continuous flex ible member 31.
  • the guide rollers 32, 35, the continuous flexible member 31 and the pivoting arms 23, 25 are returned to the raised position of Figs. 6, 7, 8. by means of reverse operations with respect to those described above.
  • the new continuous flexible member 31 is kept in traction by the stretching bar 53, so that the first branch of the continuous flexible member 31 takes a rectilinear shape and vacates the underlying space, in which the cassette 13 is inserted with the first corrugating roller 15 and the second corrugating roller 17 (Figs. 3, 4, 5).
  • the pressing unit comprising the continuous flexible member 31, the guide rollers 32, 35, the pivoting arms 23, 25 and the beam 27 is lowered to the working position (Figs. 1, 2).
  • the continuous flexible member 31 When the single facer 1 is in the working position, the continuous flexible member 31 must be kept correctly stretched and guided about the guide rollers 32, 35 The width of the continuous flexible member 31 and the axial length of the guide roll ers 32, 35 are very large with respect to the length of the continuous flexible member. This makes guiding the continuous flexible member 31 particularly critical.
  • an adjust ment and guiding arrangement of the continuous flexible member 31 is provided, de scribed below, with particular reference to Figs. 14 to 23. This system serves to main tain the correct stretch of the continuous flexible member 31, to prevent or correct any skidding in the transverse direction, i.e.
  • Twisting occurs when the two edges of the continuous flexible member 31 advance unevenly, such that a line of the continuous flexible member 31 originally parallel to the rotation axes of the guide rollers 32, 35 is displaced, taking a position no longer parallel to such rotational axes.
  • respective actuators are associated with the pivoting arms 23, 25, which adjust the distance between the rotation axes of the two guide rollers 32, 35, independently for the two sides of the single facer 1. Furthermore, provided on one of the two sides of the single facer l is a further actuator, associated with one end of one of the two guide rollers 32, 35, which adjusts the inclination of the axis of such guide roller in a transversal direction, and preferably approximately orthogonal to the adjustment direction of centre-to-centre distance of the guide rollers.
  • first guide roller 32 is supported on the first pivoting arm 23 by means of a first support 32.1 and on the second pivoting arm 25 by means of a second support 32.2.
  • second guide roller 35 is supported by means of a first support 35.1 thereof to the first pivoting arm 23 and by means of a second support 35.2 to the second pivoting arm 25.
  • the supports 35.1 and 35.2 of the second guide roller 35 are mounted in a fixed position with respect to the first pivoting arm 23 and with respect to the second pivoting arm 25, while the supports 32.1 and 32.2 of the first guide roller 32 are mounted so that they can move in a controlled manner with respect to the first pivoting arm 23 and the second pivoting arm 25 as described in detail hereinafter.
  • first support 32.1 of the first guide roller 32 and the second support 32.2 of the first guide roller are mounted in respective mov able units, one of which is indicated in detail in the section of Fig. 20 and indicated with 71.
  • the supports 32.1 and 32.2 are pivoting supports, i.e. they allow a variation of the inclination of the rotation axis 33 of the first guide roller 32, for the purposes and in the manner described below.
  • the movable unit 71 contains the first support 32.1 of the first guide roller 32 and it connects it to the first pivoting arm 23 as described hereinafter.
  • the second support 32.2 of the first guide roller 32 is mounted in the same way, with a similar movable unit 72, on the second pivoting arm 25, see in particular Figs. 17, 18, 19 and 20
  • the movable unit 71 has a seat 71.1 for the first support 32.1 of the first guide roller 32.
  • the movable unit 71 is constrained with the pivoting arm 23 by means of a rocker arm 73, pivoted to the movable unit 71 at one end and to the pivoting arm 23 at the opposite end.
  • the axes for pivoting the rocker arm 73 to the arm 23 and to the movable unit 71, respectively, are indicated with 73.1 and 73.2.
  • the movable unit 71 is further constrained to the pivoting arm 23 by means of a first actuator 75 for adjusting the traction of the continuous flexible member 31.
  • the first actuator 75 is a linear actuator, for example a cylinder-piston actuator, preferably of the double-acting hydraulic type.
  • the actuator 75 comprises a cylinder 75.1 formed in the movable unit 71, within which a piston 75.2 slides.
  • the stem of the piston 75.2 is pivoted to the first pivoting arm 23 in 75.3.
  • the movement of the actuator 75 causes a pivoting of the rocker arm 73 and an ensuing movement of the rotation axis 33 of the first guide roller 32 with respect to the pivoting arm 23.
  • a similar arrangement is provided for connecting the second support 32.2 of the first guide roller 32 to the second pivoting arm 25.
  • Acting on the two actuators 75 associated with the two supports 32.1 and 32.2 allows to modify the traction of the continuous flexible member 31 due to the variation of the distance between the rotation axes 33 and 37 of the two guide rollers 32, 35.
  • the two actuators 75 on the two sides of the single facer 1 can be actuated independently of each other, in the sense that they allow independent adjustments of the position of the respective support 32.1 and 32.2 of the first guide roller 32 in rela tion to the corresponding support 35.1 and 35.2 of the second guide roller 35. This allows to keep the continuous flexible member 31 guided properly and stretched properly.
  • the independent actuation of the actuators 75 allows to modify the inclina tion of the rotation axis 33 of the first guide roller 32, so that it is not perfectly parallel to the rotation axis 37 of the second guide roller 35. This variation of the inclination may serve, for example, to compensate or correct a twisting of the continuous flexible member 31.
  • the actuators 75 can be controlled by a control unit, not shown, based on signals coming from sensors, not shown, with which the single facer 1 is equipped.
  • a control unit not shown, based on signals coming from sensors, not shown, with which the single facer 1 is equipped.
  • load cells for detecting the traction of the contin uous flexible member 31, which corresponds to a determined pressure against the sec ond corrugating roller 17 and thus a determined gluing pressure between the smooth paper web and the fluted paper web.
  • sensors may be provided, which read the position of one or both longitudinal edges of the continuous flexible member 31.
  • the traction can be determined simply as a function of the pressure of the hydraulic fluid with which the actuators 75 are controlled.
  • the pivoting axis 73.1 of the rocker arm 73 associated with the pivoting arm 25 is fixed (see Fig. 18).
  • the piv oting axis 73.1 of the rocker arm 73 associated with the pivoting arm 23 is movable, so as to impart a further adjustment movement to the first guide roller 32. This further movement will be clearer with reference to Figs. 19, 20 and 21.
  • the pivoting axis 73.1 of the rocker arm 73 associated with the first pivoting arm 23 consists of an eccentric 73.3 which is housed in a seat 73.4 of the pivoting arm 23 (see Fig. 20).
  • the eccentric 73.3 rotates in the seat 73.4 about an axis 73.5 parallel to the pivoting axis 73.1 of the rocker arm 73 but spaced therefrom.
  • the rotation of the eccentric 73.3 is controlled by a linear actuator 77, for example an electrically con trolled jack, by means of a lever 79 (see Fig. 19).
  • the actuator 75 serves to adjust the traction of the continuous flexible member 31 and it can be coordinated with a corresponding move ment imparted by the corresponding actuator 75 of the second support 32.2.
  • the dis placement imparted by the actuator 77 by means of the eccentric 73.3 can be used to correct the displacements of the continuous flexible member 31, for example a lateral skidding, parallel to the rotation axes of the guide rollers 32, 35.
  • a homologous dis placement of the support 32.2 on the side of the second pivoting arm 25 is not neces sary.
  • Figs. 24A to 28B show further details useful for understanding the control of the traction and of the position of the continuous flexible member 31. More particu larly, Figs. 24A and 24B show, in an axonometric view, details of the pivoting arms 23, 25 and of the continuous flexible member 31 guided about the guide rollers 32 and 35. Figs. 24A and 24B represent sensors for detecting the displacements of the contin uous flexible member 31, which provide signals to a central unit 101 which controls the actuators described above, to keep the continuous flexible member 31 in the correct position.
  • each pivoting arm 23, 25 is at least one respective sensor 103, for example a magnetic sensor, which detects the twisting of the continuous flexible member 31.
  • elements detectable by the sensors 103 for example two magnets 105, are inserted along the two edges of the continuous flexible member 31.
  • the two magnets 105 are aligned on a line orthogonal to the edges of the continuous flexible member 31. Thus, they pass simultaneously in front of the respective sensors 103 if the continuous flexible member 31 reveals no twists or torsions.
  • a twisting of the continuous flexible member 31 entails a mutual offset of the two magnets 105 along the direction of advancement of the continuous flexible member 31. This is detected through a delay of a signal of one sensor 103 with respect to the signal of the other sensor and this provides the central unit 101 with information on the need to correct the two actuators 75 by means of differential actuation.
  • Possible lateral skidding of the continuous flexible member 31 can be de tected with a respective arrangement of sensors.
  • pro vided is a sensor 107 on one of the pivoting arms 23, 25 and more particularly in the illustrated example on the pivoting arm 23.
  • the sensor 107 can be an optical sensor, for example comprising one or more photocells aligned orthogonally to the edge of the continuous flexible member 31, so as to identify the position thereof.
  • optical fibre sensors there can be used optical fibre sensors, with a plurality of optical fibres along the di rection orthogonal to the edge of the continuous flexible member, which detect an optical signal coming from an opposite emitter, positioned on the opposite face of the continuous flexible member 31.
  • the lateral skidding in one direction or the other of the continuous flexible member 31 leads to a variation in the number of photocells or optical fibres which see the light signal emitted by the opposite emitter.
  • the signal obtained is used by the central unit 101 to emit a control signal for the linear actuator 77, which corrects any skidding.
  • Figs. 25A and 25B show in greater detail how the control of the traction of the continuous flexible member is carried out by means of simultaneous actuation of the actuators 75.
  • Figs. 26 and 27 show the displacements of the first guide roller 32 caused by the linear actuator 77 to correct lateral skidding movements of the continuous flexible member. More in particular, Fig. 26 is a rear view according to XXVI-XXVI of Fig. 27 and Fig. 27 is a lateral view according to XXVII-XXVII of Fig. 26 of the pressing unit 21. Two inclined positions of the first guide roller 32 are indicated with 32X and 32Y. For greater clarity, the displacements are represented as much greater than actual ones. [0100] Figs.
  • FIGS. 28 A and 28B show, in a top view of the pressing unit 21, the displace ments of the first guide roller 32 controlled by differential strokes of the actuators 75 to correct possible twists of the continuous flexible member 31. Positions inclined in opposite directions of the first guide roller 32 obtained by means of differentiated ac tuations of the actuators 75 are indicated with 32Z and 32W. Like for Figs. 26 and 27, also in Figs. 28 A, 28B the displacements are shown much greater than with respect to actual ones, for greater clarity of representation.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Machines For Manufacturing Corrugated Board In Mechanical Paper-Making Processes (AREA)

Abstract

La machine à onduler simple face (1) comprend un cadre porte-charge (3), un premier rouleau d'ondulation (15) et un second rouleau d'ondulation (17) s'engrenant mutuellement et associés au cadre porte-charge (3). La machine à onduler simple face (1) comprend en outre une structure pivotante, pivotée en direction du cadre porte-charge (3) autour d'un axe de pivotement (29) et comprenant deux bras pivotant (23, 25) supportant deux rouleaux de guidage (32, 35) d'un élément flexible continu (31). Deux actionneurs (41, 43) soulèvent et abaissent les bras pivotant et les rouleaux de guidage. Un système de charnière (23.2, 23.3) permet de maintenir la structure pivotante en porte-à-faux pour remplacer l'élément flexible continu (31).
EP21722471.6A 2020-05-05 2021-04-30 Machine à onduler simple face pour la fabrication d'un carton ondulé en ayant recours à un système facilité de remplacement de la courroie de pression Pending EP4146467A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102020000009901A IT202000009901A1 (it) 2020-05-05 2020-05-05 Un gruppo ondulatore per la produzione di cartone ondulato con un sistema facilitato per la sostituzione della cinghia di pressione
PCT/EP2021/061471 WO2021224142A1 (fr) 2020-05-05 2021-04-30 Machine à onduler simple face pour la fabrication d'un carton ondulé en ayant recours à un système facilité de remplacement de la courroie de pression

Publications (1)

Publication Number Publication Date
EP4146467A1 true EP4146467A1 (fr) 2023-03-15

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EP21722471.6A Pending EP4146467A1 (fr) 2020-05-05 2021-04-30 Machine à onduler simple face pour la fabrication d'un carton ondulé en ayant recours à un système facilité de remplacement de la courroie de pression

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US (1) US12011900B2 (fr)
EP (1) EP4146467A1 (fr)
CN (1) CN115697688A (fr)
IT (1) IT202000009901A1 (fr)
WO (1) WO2021224142A1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT202000009898A1 (it) * 2020-05-05 2021-11-05 Fosber Spa Un gruppo ondulatore per la produzione di cartone ondulato con un gruppo di pressione con un organo flessibile continuo
IT202200009695A1 (it) 2022-05-11 2023-11-11 Fosber Spa Un dispositivo per regolare ed equalizzare la tensione in un materiale nastriforme, e un ondulatore comprendente detto dispositivo

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JPS6044331A (ja) * 1983-08-23 1985-03-09 株式会社イソワ シングルフェ−サの段ロ−ル交換方法およびその装置
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JP2723494B2 (ja) 1996-06-14 1998-03-09 レンゴー株式会社 シングルフェーサにおけるベルトの交換装置
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JPH11105172A (ja) 1997-10-01 1999-04-20 Uchida Seisakusho:Kk 片面段ボール製造装置
JP4287953B2 (ja) 1999-07-29 2009-07-01 三菱重工業株式会社 シングルフェーサ
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WO2021224142A1 (fr) 2021-11-11
US12011900B2 (en) 2024-06-18
US20230234321A1 (en) 2023-07-27
IT202000009901A1 (it) 2021-11-05
CN115697688A (zh) 2023-02-03

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